Yeah you read correctly. I was inquiring about a sequential fuel pump system. I had some free time on my hands and was writing up some specs about what it would take to set one up and what the benefits and disadvantages would be with a high performance rotary engine.

Like for example: You have one pump on for normal driving and then flick a switch and have another turn on for more fuel flow. Has anyone tried or heard of this?

 

i donot know if it will work as well as you are thinking.. pumps can only pump a specific amount of volume, so putting another one inline will not do that much...

plus you have the tuning problem.. one of the setups will not be tuned properly.

 

This is what i was thinking. My 5 sec drawing. :P
Yeah I'm aware of the tunning issues, just wondering it you were able to tune them correctly will it work and better then just having one?

 

why bother with the smaller one if the injectors or carb is only going to feed so much to comustion anyway?

 

True but wouldn't there be more pressure/force coming from the fuel lines to squeeze out more fuel to the carb/injectors? What about adding more injectors or more places for the carb to recieve more fuel?

 

if your pressure is high enough then you should be fine. carbs, i'm clueless. i know that the 3rd gen owners get large secondary injectors to feed the engine on high rpms.

 

you can get larger secondaries on a 4 brl to do the same thing.

 

jeremy - Yeah I'm aware of getting larger secondary injectors for the 3rd gen owners. I was just curious if a setup like this would work for a first gen. Plus, I'm not much with doing what the norm is doing. it's always fun finding different ways of accomplishing the same task.

I wonder which would be more efficient.

riffraff - I would make the secondaries larger on a four barrel and I just want even more fuel pumped through, without flooding the engine at high speeds.

 

sorry, you said something about more injectors so i thought you'd missed that. my bad. basically, the pump should be tuned to flow slightly over the most you would need and then the carb should be tuned to distribute it from there.

 

you would want to actually rebuild the carb then, changinge the venturies, floats, and all that other good stuff.. that would allow for more fuel flow with less worry about flooding

 

i guess that is true, but wouldn't the pressure/force in the fuel line cause more fuel to be passed to the carb/injectors?

 

like a pressurized bottle of water spraying water out compared to non-pressurized dripping out?

 

that is one of the reasons that you want to change all of that stuff... it allows for the extra fuel

 

i was kinda hoping for....it runs normal with one pump and when a extra little kick is needed switch on the secondary. this way you can keep your gas milage the same unless you want to do a bit of racing. hehehe

 

secondaries automatically kick in so that would not really work.. unless you had the second fuel pump to automatically kick in when the secondaries did, and then never drive over that specific rpm unless you wanted the power...

 

arg....i forgot about that.

i don't want to drive on a certain rpm just so the secondary fuel pump doesn't turn on. i just want it turned on when needed. that's why i was thinking on having it on a switch. you get the keep the benifits of your normal gas milage but have the option to make a couple of speedy runs at a flip of a switch by providing the engine with more fuel. in ideal situations bascially flipping the switch just before doing a little race and when the secondaries open the extra fuel will be there waiting. how does that sound? or just have the extra fuel fed to the primaries?

 

Get an overkill fuel pump (I wonder which one I'm thinking about... ) and then have your toggle switch that works a high amp relay that switches between full voltage from the battery on one tab to cut-down voltage from one of V8kilr's step-down voltage boxes on the other tab. The same pump but you're cutting pressure by cutting voltage to the pump...

 

assuming the pump will work properly with low voltage, that is not a bad idea

 

V8kilr's step-down voltage boxes? I guess I'll see if I can search for it.

Thanks guys for letting me bounce a couple ideas off of you.

 

I came across this little phrase that I though was something I should keep in mind if I want to set something like this up.

-Two fuel pumps in parallel will deliver more volume but typically not more pressure.

-Two fuel pumps in series will deliver more pressure but no more flow than the smaller of the two pumps

 

more info

 

some more...

 

last one

 

I don't understand... why would you need staged fuel pumps? Just get one big enough to supply enough fuel for your engine.

 

thats what i'm saying. the carb and your right foot control how much gas you use.